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The manpage of seccomp specify that using seccomp with SECCOMP_SET_MODE_FILTER will return EACCES if the caller do not have CAP_SYS_ADMIN set, or if the no_new_privileges bit is not set. Hence, without NoNewPrivilege set, it is impossible to use a SystemCall* directive with a User directive set in system mode. Now, NoNewPrivileges is set if we are in user mode, or if we are in system mode and we don't have CAP_SYS_ADMIN, and SystemCall* directives are used.
12 lines
276 B
Desktop File
12 lines
276 B
Desktop File
[Unit]
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Description=Test for SystemCallFilter in system mode with User set
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[Service]
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ExecStart=/bin/echo "Foo bar"
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Type=oneshot
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User=nobody
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SystemCallFilter=~read write open execve ioperm
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SystemCallFilter=ioctl
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SystemCallFilter=read write open execve
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SystemCallFilter=~ioperm
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